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Conventional fault analysis algorithms may not be suitable for the AC/DC hybrid systems. To solve this problem, a mathematical model for HVDC (High Voltage Direct Current) system, which is suitable for analyzing faults in AC system, is presented in this paper. Firstly, based on the switching functions method and sequence components method, an equivalent model of HVDC converter under the asymmetric...
The conventional fault analysis methods and fault analytical models may not be feasible for the AC-DC hybrid systems because of the highly nonlinear time-varying converters. To solve the problem, the paper presents a mathematical model for the analysis of the performance of HVDC converter during the AC faults, especially asymmetric faults. The model is developed using the improved switching functions...
The paper presents a new protection principle for double circuit transmission lines of bipolar HVDC transmission system. By comparing the magnitudes of fault component of voltages on the bipolar lines, the faulty line can be identified. By comparing the polarities of fault component of currents at the ends of the faulty line, the internal faults and external faults can be differentiated. The principle...
The conventional fault analysis algorithms and fault analytical models may not be suitable for the ac/dc hybrid systems because of the highly nonlinear converters. To alleviate the problem, the paper presents a steady state short-circuit converter model based on the switching function theory for analyzing faults in the ac system, including asymmetric faults. In order to regard the effect of the short-circuit...
This paper discusses the performance of the SVC ( static var compensator ) linked to the inverter side of China-Russia Heihe BTB (back-to-back) HVDC project. Detailed Heihe BTB-HVDC primary system, China side AC 500/220kV electromagnetic loop network, the control system of BTB-HVDC and SVC are modeled using the electromagnetic transient simulation software PSCAD/EMTDC. Based on the detailed models,...
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